What's new in Claude Code
The latest Claude Code release is v2.1.325, released Nov 13, 2026. 21 releases shipped in the last 30 days.
November 2026: Claude Code adds Fable 5.2 default, MCP background tasks and deny-instead-of-prompt
So far in November 2026, Claude Code has added Claude Fable 5.2 (claude-fable-5-2) as the default Fable model, run MCP tasks in the background, and gained a setting that denies tool calls instead of waiting on permission prompts. Five releases have shipped so far, from v2.1.317 to v2.1.322.
On permissions and security, permissions.denyInsteadOfPrompting denies a call that would wait on a prompt and lets the turn continue. v2.1.321 fixed a read-only Bash command running outside the sandbox without a prompt, MCP OAuth requests sending refresh tokens to another host after a redirect, and deny rules not applying to files written by cp or mv into a directory. Auto mode behaves differently behind LLM gateways in v2.1.319; CLAUDECODEAUTOMODESERVER=0 keeps the built-in classifier.
Gateway admins get a cost report at GET /v1/organizations/analytics/cost. v2.1.322 adds fast mode on Vertex in the global, us and eu regions, falling back to standard speed if refused.
- Claude Fable 5.2 (claude-fable-5-2) is now the default Fable model, with 1M context (v2.1.321)
- MCP tasks in the terminal move to the background and report back when done; CLAUDECODEDISABLEMCPTASKBACKGROUND turns this off (v2.1.319)
- permissions.denyInsteadOfPrompting denies calls that would wait on a prompt, including in subagents and teammates (v2.1.319)
- Auto mode behind LLM gateways no longer falls back to the built-in classifier unless CLAUDECODEAUTOMODESERVER=0 is set (v2.1.319)
- Security fixes: MCP OAuth secrets sent to a redirected host, and a read-only Bash command running outside the sandbox (v2.1.321)
- Fast mode on Vertex in the global, us and eu regions, with fallback to standard speed (v2.1.322)
October 2026: Claude Code adds Claude Mods, idle compaction, Haiku 5.5 and tighter sandbox checks
Claude Code's main changes in October 2026 were Claude Mods, which let plugins modify deeper behavior, plus idle compaction, a new default Haiku model and a long run of permission and sandbox fixes. Twenty-six releases shipped, from v2.1.287 to v2.1.316.
v2.1.293 added Claude Haiku 5.5 (claude-haiku-5-5) as the default Haiku model on the Anthropic API. Idle compaction in the terminal (v2.1.299) compacts a 200K+ token conversation left idle before its prompt cache expires, with an "idleCompaction": false setting to turn it off, and v2.1.314 extended it to VS Code and Claude Desktop. Hooks gained onFailure: "block" (v2.1.295), /code-review gained --max-findings (v2.1.288), and v2.1.314 added permissions.blockWritesOutsideWorkingDirectories. v2.1.309 closed several sandbox and Bash permission gaps. Later releases added many Claude apps gateway options for admins. v2.1.316 notes that Opus 4.8 fast mode retires before November 30, 2026.
- Claude Mods let plugins modify deeper behavior, with many mod hooks added through the month (v2.1.287)
- Claude Haiku 5.5 (claude-haiku-5-5) becomes the default Haiku model on the Anthropic API (v2.1.293)
- Idle compaction compacts 200K+ token conversations before the prompt cache expires; extended to VS Code and Desktop (v2.1.299, v2.1.314)
- onFailure: "block" makes command and HTTP hooks block the action when they fail (v2.1.295)
- permissions.blockWritesOutsideWorkingDirectories stops Write, Edit and NotebookEdit outside working directories (v2.1.314)
- Sandbox and Bash permission check fixes, including startup files running outside the sandbox on macOS and Linux (v2.1.309)
Latest Claude Code releases
- v2.1.325 (Nov 13, 2026) — Claude Code 2.1.325 is here: a security fix for zstd decoding, smarter subagent model handling, compaction that finally works on third-party gateways, and a long list of auth and MCP fixes. Curious wh
- v2.1.323 (Nov 12, 2026) — Claude Code 2.1.323 is here with experimental Code Mode, where Claude writes JavaScript to call its tools. Plugins now honor version ranges, and validate catches TypeScript hook issues. Plus a long li
- v2.1.322 (Nov 10, 2026) — Claude Code 2.1.322 brings fast mode to Vertex in global, us, and eu regions. If Vertex declines it, you automatically drop back to standard speed. Curious how much faster your sessions can run?
- v2.1.321 (Nov 9, 2026) — Claude Code 2.1.321 is here: Fable 5.2 is now the default, remote-control takes a settings file, and a batch of permission and security gaps got patched. Curious what else slipped through the cracks?
- v2.1.319 (Nov 6, 2026) — Claude Code 2.1.319 is out: MCP tasks now run in the background, auto mode behaves differently behind gateways, and a new setting can deny prompts instead of waiting. Want the details?
- v2.1.318 (Nov 3, 2026) — Claude Code 2.1.318 is here: earlier warnings before your claude.ai sign-in expires, quieter config writes, and a long list of fixes for sessions, MCP servers and remote hosts. Curious what else chang
- v2.1.317 (Nov 2, 2026) — Claude Code 2.1.317 is out: new cost reports for gateway admins, safer Agent SDK hooks that can block on failure, and a long list of fixes. Curious what else changed?
- v2.1.316 (Oct 31, 2026) — Claude Code 2.1.316 is here: pooled group budgets, a new subagent effort setting, and a fix for shell commands left running after exit. Opus 4.8 fast mode is retiring, so plan your migration to Opus 5
- v2.1.314 (Oct 30, 2026) — Claude Code 2.1.314 is here: lock writes to your working directories, route gateway traffic by IdP group, and let long idle chats compact themselves. Plus a long list of fixes. Want to see what else c
- v2.1.312 (Oct 27, 2026) — Claude Code 2.1.312 is out: custom OIDC user ID claims, safer large-file edits, a shorter prompt for custom model names, and a pile of fixes. Curious what else changed?
Upgrading from v2.1.312? See every change since.